In the second episode of our listener questions special, Ian Sample tells Madeleine Finlay what he has uncovered about who the exercise guidelines were created for and whether they apply to all of us, which exercises are best for keeping us strong, whether we should be eating particular foods when we exercise, and how much protein we need to consume if we’re packing in the hours at the gym. With contributions from Jason Gill, professor of cardiometabolic health at the University of Glasgow; Benjamin Wall, professor of nutritional physiology at the University of Exeter; Clyde Williams, emeritus professor of sports science at Loughborough University; Victoria Taylor, head of clinical support at the British Heart Foundation and I-Min Lee, professor of medicine at Harvard Medical School